Fuse



5m. 19, w39. H, `G, TOWNER 173343 FUSE Filed sept. 2, 1938 Inventur?" Havnll E 'Tnwl-Lav.

Attn-P11151 y Patented Sept. 19, 1939 tf1 STATES PATENT OFFICE (Granted under the act of March 3, 1883, as amended April 30, 1928; 370l O. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

'Ihe subject of this invention is a fuse.

The purpose of the invention is to provide a simple and inexpensive combination fuse having provision for instantaneous and delay firing action. This is accomplished by forming the fuse casing of only two relatively movable parts, the impact part carrying an adjustable bolt which is positioned either to clear or to actuate a firing pm.

To these and other ends, the invention consists in the construction, arrangement and combination of elements described hereinafter and pointed out in the claim forming a part of this specification.

A practical embodiment of the invention is illustrated in the accompanying drawing wherein:

Figure 1 is a longitudinal sectional view of the fuse with the parts adjusted for delay firing action;

Fig. 2 is a similar view with the parts arranged for instantaneous firing action;

Figs. 3 and 4 are detail sectional views on the corresponding lines of Figs. 1 and 2, respectively;

Fig. 5 is a perspective View of the thimble.

Referring to the drawing by characters of reference, there is shown a fuse comprising a body 5 having threads G for attaching it to a bomb casing and formed with a flanged head 'I having a central recess 8 and a communicating radial slot 9. The inner end of the body carries an eccentrically positioned primer-detonator I which is in communication with converging passages II and I2, the passage I I containing and providing for movement of a firing pin I3 and the passage I2 arranged to conduct the ash from a primer-delay train I4. A shear pin I5 in the body holds the firing pin I3 clear of the primer-detonator and with its outer end extending into the recess 8.

A striker I6 carrying a firing pin I'I in its inner end is partially disposed in the recess 8 of the body and includes a radially disposed rib I8 slidable in the slot 9. The striker also includes a flanged head I9 overlying the head l and spaced therefrom by a plurality of blocks 20 which normally maintain the inner end of the striker in spaced relation to the floor of the recess 8 and hold the firing pin I'I clear of the train I4. The blocks are confined in a well known manner by a cap 2l which has a spindle 22 threaded in the striker. Vanes 23 on the cap serve in the usual manner to provide for rotation of the cap during flight and its removal from the fuse when the spindle is completely unthreaded in order to free the blocks 20 which fall clear. With the cap ret r l moved, the striker is held against movement by a pin 24 which is sheared on impact.

A bolt 25 disposed radially of the fuse is mounted in an opening 26 in the rib I8 of the striker for both rotational movement and axial displacement. The striker is also formed with a passage 2l arranged parallel to the axis of the fuse and intersecting the opening 26. The outer end of the firing pin I3 is normally inserted in the inner portion of the passage 21 below the opening 26. The bolt 25 has two positions of adjustment, one, as shown in Fig. 1, in which it is clear of the passage 21, and the other, as shown in Fig. 2, in which it is interposed in the path of the firing pin.

The bolt is held in either one of these positions of adjustment by means of a pin 28 which is selectively engageable in deep slots 29 and in shallow slots 30 formed in a thimble 3I. The thimble is fixed in the striker to constitute a closure for the opening 26 and has an aperture 32 for the bolt. A spring 33 seated on the floor of the opening 26 acts on a collar 34 of the bolt to maintain the pin 28 in either one of the sets of slots. Adjustment is made by pressing in on the bolt and then imparting a quarter turn before releasing it.

In Fig. 1 the parts are shown in the position of adjustment for delay action ring. With the cap 2| and blocks 20 removed during ight the striker is held in place by the shear pin 24. On impact the striker is driven rearwardly, the outer end of the ring pin I3 is not actuated, and the firing pin II functions the delay train I4.

In Fig. 2 the parts are adjusted for instantaneous action and when the striker is driven rearwardly the bolt drives the firing pin I3 into the primer detonator I0, shearing the pin I5.

I claim:

In a fuse, a body having passages and having in its front part a recess and a communicating radially disposed slot, a primer-detonator carried by the body at one end of the passages, a primerdelay train in communication with one of the passages, a first firing pin in the other passage, a shear pin in the body and supporting the firing pin with its outer end extending into the recess of the body, a striker having its inner end disposed in the recess of the body and including a radially disposed rib disposed in the slot of the body, a shear pin holding the striker against movement relative to the body, a second firing pin carried by the striker in line with the primerdelay train, a bolt mounted in the rib of the striker for rotational and axial displacement, and means for selectively holding the bolt in or out of the path of the :first firing pin.

HAROLD G. TOWNER. 

